I have the Nikon D500, with the latest firmware and have not changed anything on the camera.
Snapbridge was working for image transfers between the camera and an iPhone running iOS 11. I would select the picture to send and the D500 would automatically connect to my phone and transfer the image.
I have removed the D500 from my phone and my phone from the D500 and reinstalled by going through all the steps. I have a connection between the two and the Bluetooth icon on Snapbridge shows a connection with my phone. It also shows if the battery on the D500 gets low. I cannot get the pictures to transfer though through Bluetooth. I can get them if I transfer to wifi, but I like the ease and convenience of Bluetooth.
Any suggestions would be great.